Hopefully, that means he'll probably disobey Order 66.
Apparently Rex is supposed to be a bit disheartened with the Republic. I hope that gets expanded in the next arc...
BTW, anyone else dislike Rex's new helmet? I sure do, since I would've prefered the standard Phase II helmet.
I don't. It gives him more personality and allows him to stand out more, IMO. The armour is not just an aesthetic trait. It reflects the character as well.